power: Add DVFS stub

Change-Id: I23837ff88a0a7b23474348b6fe8eee15cfe91e10
wifi: Choose correct nvram file on samsung hardware

Change-Id: I9d428ae61c1ce80d97e6ea513839ed64e8f61440
wifi.c: allow devices to specify driver delay

This is necessary on the Samsung smdk4210 tablets. Without
the delay, it takes roughly 30 seconds to enable wifi.

Change-Id: I6a3419e66958fc72ae60e5294f52124b1180d752
wifi: Add support for AP module args

 * Needed for Samsung's goofy handling of AP mode

Change-Id: I5ec65460b7c9f8ef34170473cf1bdaa36587767b
wifi: fix samsung wifi logic

Change-Id: Ib065c0dffa1265a17f5e4fd6ec0b0ad36bbc7b14